gitlab-ci: Remove remaining allow_failure attributes
Currently there are a few jobs that we are still allowing to fail:
-
*-linux-hadrian
(done in !1156 (closed)) -
validate-aarch64-linux-deb9
-
nightly-aarch64-linux-deb9
-
release-x86_64-linux-deb9-dwarf
-
validate-x86_64-windows-hadrian
(see #16574 (closed)) -
validate-x86_64-windows
-
release-x86_64-windows
-
validate-x86_64-windows
-
release-x86_64-windows
-
release-i386-windows
-
nightly-i386-windows
These should be made robust and the allow_failure
attribute removed.